Automatic telephone system.



ULGOODRUM.

AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED MAY 10, 1915.

Wl'iwesaes including in circuit Wyn m ime t tiff with. infield?GHAIELLJES L. GOUDRUM, til!" l 'llllliv Til? VJ'ESTEEN EIJEUTIEIQ To allwitom it may Be it known that l, CHARLES Economic a citizen of theUnited residing st New York, in the county of New York nd. State of liew lfi'n'lt invented ceitsnn. new and useful lrnpeo cnients inAutonoetic Telephone iiystenis of which the following; a full, elect,concise, emct descrip" Zion.

Elhis we ion relates to telephone one change systems employing inochineswitch-- inn, and poi'ticulei'ly to systems oi em chain? consi .ing of onumber of oilices'.

ln trunking hetween oiiices in such on changes it is the practice toi'eley or repeat the impulses for setting the selectors et the distantofice from the incomiong, oilice to the distent office.

Due to the conductive separation of the trunk jlllCllll) at the repeaterby condensers,

it ienecessery to provide means for i venting such condensers fromchonginge the chcrecter of the impulses relayed to the dis tent oificeto set the selectors thereon which they would otherwise do indischarging Repeaters hove been employed wherein relays disconnect thecondensers from the trunk While the impulses EH39, being tronsinittcd.After the ctoi's at the distant oilice hove been set, these relays con--nect condensers to plete the talking circuit This invention providesa..- repeeter circuit wherein. .ie lays, on their eqitvolen s, necessaryand co in inductively unitingthe incoming line flith the outgoing trunkby a low cepocity reheating coil, and

unit to con1- highly efficient use of such ierendered on with therepeater Windings on the incoming side it relay which. 18

adopted to be operated by the sender in accordance with the digits ofthe Wanted number to actuate e contact in circuit with the repeaterwindings in the trunk 0 outgoing side to produce impulses therein forsetting the selectors at the distant oflice.

The invention will be more reedily understood when described byreference to the accompanying droning which illustrates only so much oftelephone 15* stein es 1s tint-annotation of Letters li etcnt.

.ttnnlicntion litey M2,

- coil 9, conductor 25, right-bondwinding of itextented ltelo, co, int?wit. sem no. emote.

Wanted line. The first selector would then in the Wellflmovvn mannerautomatically plclz: out an idle one of these trunks. The operation ofthe sppcretus up to this point is Well. known and ther'efo e need not bedescribed. It niey be of the type shown in U. Potentldlilfilll. i Whenthe idle trunk is found, the relay '8 is energized by a circuit lendingto the substation A as follows: free pole of the battery, leftlmndwinding of relay 6, conductor '2, Winding 8 oft-he repeating coil 9,conductor 10, contact 11 of the ifii'stxse lecton, brush ithereof,conductor 12; lo 'ush 2 of the finder, contact 13 thereof, linecondoctor 14:, primary Winding lii of the induction coil rat substationA, contact 16 and switchliook 1T, transmitter 18 conductor 19, sender 5linden contact 20, lincler brush 1, conductol." 2]., first selectorbrush 3, Contact 22, conductor 23, winding 24. of repeating relay 6, toground. The relay 6 at its lefthand front contact closes o circuit for aslow relay 26, which opens the circuit of release magnet 27 at the firstselector. Relay 6 at its i'ight hond armature and front contact closesthe trunk circuit lending to the distant ol'lice as follows: free poleof the bot tery, lefthcnd Winding; of clay 28 of the connector at thedistant office, conductors 29, 30, winding 31 of repeating coil 9,conductor 32, right-hand armature and front contact of relay 6,conductor 33, winding 34 oi repeating coil 9, conductors 35 end 36,right-hand Winding ofrelay 28 at the connectoi", of ground. Thesubscriber at sub station 2 now operates his dial. 5 in accordance withthe tens digit of the number of: the Wantedline. Each time the circuitof relay 6, above traced, is interrupted by the sender 5, the relay 6 isdecnergized and interrupts at its right-hand armature and front contactthe circuit traced for relay 28 at the connector. The armature of thisrelay in vibrating operates the primary magnet of the connector, whichmagnet elevates the brushes 40, 19 to the level containing the terminalsof the Wanted line in the Wellknown manner. At the end of this series ofinterruptions, when the sender completely restores and maintains theline relay 6 energized, the continued energization of the relay 28 atthe connector will causethe changeover operation to take place at theconnector to shift the circuit leading from the contact of the relay 28from operative relation to the primary magnet of the connector and intooperative relation with the secondary magnet thereof. The subscriber atsubstation A now operates his dial 5 in. accordance with the units digitof the num ber of the wanted line, whereupon the circuit of relay 6 isagain intermittently interrupted, which in turn intermittentlyinterrupts the circuit of relay 28 at the connector which transmitsimpulses to the secondary magnet thercat to step the connec or brushes&0, if) to the terminals of the wanted line, whereupon the line istested and it idle, ringing current is sent thereover, or it busy, abusy signal is sent back to the calling subscri er. The apparatus foraccomplishing these functions may be similar to that shown in the patentmentioned.

When the subscriber at substation B removes his receiver, in response tothe ringing current, the following circuit is closed to supply him withtalking current: free pole of the battery, left-hand winding of relay37, conductors 38, 39, connector brush l0, terminal 41, conductor in,transmitter 4L3, switchhook 44-, conductor in, primary winding 46 (ifthe induction coil, conductor 47, terminal 18, connector brush 49,conductors 50, 51, right-hand winding of relay 37, conductor 52, toground. The direct current which is supplied to the calling subscriberat substation B is prevented from flowing over the trunk conductors 30,by condensers 53, 54 at the connector.

\Vhen the calling subscriber at substation A restores his receiver, heinterrupts at switchhooh 17 and contartlli oi the substation apparatus,the circuit of relay (3. This relay allows its armatures to fall back.The left-hand armature in falling back causes the dei ncrgization oi;the slow relay 26, which completes the circuit of release magnet 27 ofthe first selector over the following circuit: free pole of the IM- .;rv, release magnet 27 oi the selector, conductor 55, brush 56 of: theselector, test contact 5?. conductor 58, armature and back contact ofslow relay E26, condutcor 59., left-hand armature and back contact ofrelay o to ground. The right-hand armature of the relay (3, in fallingback, causes the (lei nergization oi relay 28 at the connector, which atits armature and back contact may close the con-- nector release circuitto restore the CONJUNP tor. The apparatus now restored and ready to beused in establishiiur another connectio ii.

What is claimed is:

1. In a tele il'mno QXClifll'lfIO system, the combination with a pair ofline oondiurtors, a. connecting circuit in. sections, a repeating: coiluniting said sections iiuiuctively. and means for connecting said linecm with said connecting circuit, oi relay, a metallic circuit including!conductors, said relay and the remain; windings in the incoming);section of saii'l connecting circuit, said relay havii'u a M l:- tactincluded in the outgoing section c said C(illlitiCtlllg circuit, meanl'or op um." ing said relay in accordance with the di, of the callednumber, and automatic sw oi (s adapted to be set by the impu... s so p'o- (luced.

'2. In a telephone exchange system, combination with a pair of linemoduciw, a connecting circuit in sections a icpvaiui coil uniting saidrvoctions in(luvl,iv l r, means for connecting said lno wii'iduci: withsaid conucrlin circu Y, of stoppio j, relay, a metallic circuitincluding: so conductors, said relay and the repeate wii'idiugs in theincoming section of said connecting circuit, said relay lwvins: a clubtact coutrollii'ig the continuity oi too uillfi inn? section. ol saidconncclii o circuil, a sender adapted to inieri'iuit said nurial iccircuit and thus operate said relay, and automatic switches adapted tobe set oy the impulses so produced. I

3. in a telephone exchange system, the combination with atalli'iuecircuit divided into sections, a repeating coil uniliugi saidsections inductively, of a relay bridggcd across the n'iiddlc point ol?one side of said repeating coil and having a contact coin trolling thecontinuity of the other section, means for operating;- said relay inaccordance with thediggits of the called number, and automatic switchesadaptor: to ho sol by the imliiulses'so produced.

4. In a telephone exchange ,--.,'u -m. the conibinaiioi'i with a pair ofline conductors. a connecting" circuit in sections. means l'orinductively uniting said scclious inrludiw 3;"

feed coils and a source of current, of a step:-

ping i'eizim 2E, metallic circuit including; smici line sonductors, saidrelay and. the feed coil windings in the incoming section of saidiconnecting circuit, said relay having ii c0iitact ineiuded in theoutgoing section of said connecting circuit, means foir operating saidrelay accordance with t e digits 0f the caiied number, and ziiiwmaiicSWiilflhi-ES adapted to be set by ehe impiiims so pi-uducted.

In Witness whereof iieiimiiiiu siibsc 'iiae my name this 8th day or" liiaxy, W15.

CIHLRLES L. G-UUDRUM.

